Worker: Stop calling Isolate::TerminateExecution() on a worker thread

third_party/WebKit/Source/core/workers/WorkerThread.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 123 matching lines @@
     void performShutdownOnWorkerThread();
     void performTaskOnWorkerThread(std::unique_ptr<ExecutionContextTask>, bool isInstrumented);
     void runDebuggerTaskOnWorkerThread(std::unique_ptr<CrossThreadClosure>);
     void runDebuggerTaskDontWaitOnWorkerThread();
 
     bool m_started = false;
     bool m_terminated = false;
     bool m_readyToShutdown = false;
     bool m_pausedInDebugger = false;
     bool m_runningDebuggerTask = false;
-    bool m_shouldTerminateV8Execution = false;
 
     OwnPtr<InspectorTaskRunner> m_inspectorTaskRunner;
     OwnPtr<WorkerMicrotaskRunner> m_microtaskRunner;
 
     RefPtr<WorkerLoaderProxy> m_workerLoaderProxy;
     WorkerReportingProxy& m_workerReportingProxy;
 
     // This lock protects |m_workerGlobalScope|, |m_terminated|,
-    // |m_readyToShutdown|, |m_runningDebuggerTask|,
-    // |m_shouldTerminateV8Execution| and |m_microtaskRunner|.
+    // |m_readyToShutdown|, |m_runningDebuggerTask| and |m_microtaskRunner|.
     Mutex m_threadStateMutex;
 
     Persistent<WorkerGlobalScope> m_workerGlobalScope;
 
     // Signaled when the thread starts termination on the main thread.
     OwnPtr<WaitableEvent> m_terminationEvent;
 
     // Signaled when the thread completes termination on the worker thread.
     OwnPtr<WaitableEvent> m_shutdownEvent;
 };
 
 } // namespace blink
 
 #endif // WorkerThread_h